Mersen GSF4/10 - Miniature fuse GSF - Time-Delay 250VAC 0.4A Size 5x20 Ferrule
Mersen

GSF4/10

Alternate Item Number: GSF4/10

UPC: 782001244989


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Overview

The Mersen GSF4/10 miniature fuse (SKU: GSF4/10) provides reliable overcurrent protection for low-power AC circuits. Rated at 250VAC and 0.4A, this time-delay fuse is designed for applications requiring protection against temporary inrush currents while ensuring rapid interruption during sustained overloads or short circuits. The ceramic body construction delivers superior thermal and mechanical stability, making it ideal for demanding industrial and electronic environments. Key specifications include a 5x20mm ferrule size for standard fuse holder compatibility, UL and CSA recognition for 250VAC circuits, and SEMKO/VDE approval for 250VAC applications. The time-delay characteristic prevents nuisance blowing from transient surges, such as those from motors or capacitive loads, while maintaining fast response to hazardous conditions. Typical applications include control systems, instrumentation, power supplies, and consumer electronics where precise current protection is critical. Mersen, a global leader in electrical protection, ensures this fuse meets stringent quality standards for consistent performance. The GSF4/10 is part of the GSF series, which offers a range of current ratings from 0.25A to 10A in the 5x20mm format, providing flexibility for diverse circuit protection needs.
  • 250VAC voltage rating for AC power applications
  • 0.4A current rating for precise overcurrent protection
  • Time-delay operation prevents nuisance blowing from transient surges
  • 5x20mm ferrule size for standard fuse holder compatibility
  • Ceramic body construction for thermal and mechanical stability
  • UL and CSA recognized for 250VAC circuits
  • SEMKO and VDE approved for 250VAC applications

Specifications

AC Voltage Rating
250 V
Amperage Rating
0.4 A
Application
Electronic circuits
Brand Name
Mersen
Case
Ceramic
Case Material
Ceramic
Class
Supplemental
Connection
Ferrule
Connection Type
Ferrule
Current Rating
0.4A
Material
Ceramic
Mounting
Clip
Series
GSF
Size
0.79 x 0.2 in
Size
20.066 x 5.08 mm
Size
5x20mm
Size
0.79 x 0.2;20.066 x 5.08 in;mm
Special Features
Ceramic body Time-delay 5 mm x 20 mm
Standard
1/2A through 8/10A, 250VAC 1A through 6-3/10A, 250VAC, SEMKO, VDE Approved 1A through 10A, 250VAC, UL and CSA Recognized IEC-127-2 Standard Sheet 5
Type
5x20mm
Voltage Rating
250 VAC
Package Dimensions (L x W x H)
0.79 in x 0.2 in x 0.2 in
Package Dimensions (L x W x H)
20.066 mm x 5.08 mm x 5.08 mm
Package Weight (Imperial)
0.010 lb
Package Weight (Metric)
0.005 kg
Miniature fuse GSD - Fast-Acting 250VAC 0.4A Size 5x20 Ferrule

GSD4/10

Miniature fuse GSD - Fast-Acting 250VAC 0.4A Size 5x20 Ferrule
VERY FAST-ACTING PICO II M-PACK .630A. The PICO® II Very Fast-Acting Fuse is designed to meet an extensive array of performance characteristics in a space-saving subminiature package. Features: Very fast-acting. Small size. Wide current rating range (62mA- 15A). RoHS compliant. Halogen-free available. Wide operating temperature range. Low temperature rerating.

0251.630MXL

VERY FAST-ACTING PICO II M-PACK .630A. The PICO® II Very Fast-Acting Fuse is designed to meet an extensive array of performance characteristics in a space-saving subminiature package. Features: Very fast-acting. Small size. Wide current rating range (62mA- 15A). RoHS compliant. Halogen-free available. Wide operating temperature range. Low temperature rerating.

Frequently Asked Questions about Mersen

What industries and applications are Mersen products used for?

Mersen products are used across diverse industrial sectors including solar power, electric vehicles, buildings/construction, industrial automation, power distribution, HVAC, elevators, telecommunications, and specialty manufacturing. Key application areas include circuit protection, surge protection, battery module protection, electrical safety systems, and power management for residential, commercial, and utility-scale installations.

What are the main product lines offered by Mersen?

Mersen offers five primary electrical power product lines: IEC and UL/CSA Fuses and Fusegear, Surge Protection, Low Voltage Disconnect Switches, Power Distribution Blocks, and Engineered Solutions. Their comprehensive range includes specialized components like high-speed fuses, modular fuse holders, surge arresters, and custom-engineered electrical protection systems for industrial and power management applications.

What are the key features of Mersen products?

Mersen products feature advanced electrical protection and power management solutions with key characteristics including finger-safe design, compact modularity, and high-performance safety features. Their product lines span electrical power components like fuses, surge protection, power distribution blocks, and specialized solutions for industrial, solar, and building applications. Critical features include UL/CSA approvals, high short-circuit current ratings, and innovative technologies like the Fuse Control™ program that minimize electrical risks and optimize system performance.

What environmental ratings do Mersen products have?

Mersen products meet rigorous environmental ratings across multiple standards, including UL 508A Type 1, 2, 3, 4, 4X, 12, and 13, CSA Type 1, 2, 3, 4, 4X, 12, and 13, and NEMA Type 1, 2, 3, 4, 4X, 12, and 13. They feature IEC 60529 IP66 protection, with enhanced UV inhibitors for outdoor weathering and operating temperatures ranging from -40°C to 130°C (-40°F to 266°F). These ratings ensure superior protection in wet, corrosive, and challenging industrial environments.

What accessories are available for Mersen products?

Mersen offers multiple accessories for their fuse blocks and systems, including safety pullers (DFC3M and DFC3LP), DIN-rail adapters (DRM), bus bars, auxiliary contacts, and specialized mounting hardware. Key accessories include the DFC3M safety puller for 1-1/2" x 13/32" midget or Class CC fuses, the DRM adapter for mounting 303 series fuse blocks on DIN-rail, and UltraSafe fuse module accessories like bus bars and auxiliary contacts that enable module interconnection and monitoring.

How are Mersen products typically installed?

Mersen products are typically installed in electrical distribution systems, control panels, and industrial automation environments using multiple mounting options. These include service entrance panel mounting, distribution panel installation, control panel DIN rail mounting, and custom engineered solutions like Fused Coordination Panelboards. Installation depends on the specific product type, such as fuses, surge protective devices, or switches, and is designed to provide electrical protection and circuit safety in various industrial and commercial applications.

What certifications and standards do Mersen products comply with?

Mersen products are certified to multiple international standards, including UL (Underwriters Laboratories), CSA (Canadian Standards Association), CCC (China Compulsory Certification), and EAC (Eurasian Conformity). Our products meet rigorous safety and performance standards for industrial applications across North America, China, Russia, and other global markets, ensuring compliance and reliability in electrical power and advanced materials solutions.

What technical support does Mersen offer?

Mersen provides comprehensive technical support through multiple channels, including technical experts located in your time zone who can assist with product selection, application guidance, and troubleshooting. Their Fuse Control™ program offers a free Fuse Inventory Audit & Analysis, and customers can access technical resources through their sales representatives and online platform ep.mersen.com.